Awesome from the Dollar Tree and a scrub brush, finish with a pressure washer if you have it. Laquer thinner, paint thinner, mineral spirits, Prep-sol all seem to work well also.
I've collected 21 stud parts for quite a while trying to get one good block for my 36PU. I found a wide variety of heads of all descriptions. Water pump heads for domed pistons are not common. I think they were made by Ford to use on 37-38 engines with domed pistons to allow installation in...